Kiln for



i 3 vsheets-snee 1.

H. H. BURDEN.

KILN FIOR ROASTING ORES.

Patented Peb. 8, 1887.

3 Sheets-Sheet V2.

(No Model.)

H. H. BURDEN.

KILN PoR ROASTING GRES.

No. 357,456. Patented Feb. 8, 1887.

@www

(No Model.) 3 Sheets-Sheet 3.

H. H. BURDEN.

KILN FR ROASTING DRES.

\ No. 357,456. Patented Feb. 8.1887.

, lfw fyfffw@ yHOWARD n. BURDN,

Partnr erron or tenor, .NEW YORK.'

`Kl LN ron.` consu No ones.

SPECIFICATION forming part of lliettere Patent No. 357,456, datedFebruary 8,1857.

'. Application filed May 5, 1826.

.To all whom itrmwy. concern:

' Be it known that I, Howarth EBURDEN, a citizen of the United States,residing at Troy,

in the county of RensselaerY and State of New Improvements in KilnsforRoastingOreS; and do hereby declare that the following is a full,clear', and exact description thereof, which, in connection with thedrawings, making a part vof this specification, will enable othersskilled in the art to which my invention belongs to make and usethesame.

My invention relates to kilns for the cou tinuous roasting of iron orother ores; and it consists in certain novel features of constructionofa kiln, for the purpose of eliminating injurious .admixtures,producing a higher oxidation, and a more thorough and quickercalcination, and also a more rapid cooling of the roasted ore, therebyyielding an improved and increased product more economically.

Referring to the drawings, Figure l represents a central verticalsection through the kiln, take.. on liner .'r, Fig. 4, looking in thedirection of arrow a, saine figure. Fig. 2 represents a central verticalsection through the kiln on line y y, Fig. 4, looking in the directionof arrow b, saine figure. Fig. 3 represents a horizontal cross-sectionon line w zu, Fig. 1, looking in the direction of arrow c, saine figure.Fig. 4 represents a horizontal cross-section, taken on line z z, Fig. l,looking in the direction of arrow'c, same figure.

In the accompanying drawings thc part marked Ais the cylindrical shellof the kiln for holding the oreand fuel. which are introduced at the toof the kiln. Said shell is preferably made of hrelbricks, which aresurrounded and inclosed by an iron'jacket, A, through which there are inthis instance four vertical rows of holes, B. l

. Thelower part'ofrthe cylinderor shell A is provided withgbQShcS C,sloping inlward,'and provided with numerous openings, D, for thelpurfposeofadniittiug air.

y A,mant1e,Econstructed of cast-iromfrests. nponthesubstructureF ofthe'kiln, made of urnasonrand serves -tonsupport the lining .of

York, have invented. certain new and" useful Serial No. 201,168. (Nomodel.)

V through the saine upon four sides thereof; which are provided withmetallic chutes H, extending out therefrom. Said chutes Hserve for thewithdrawal of the roasted ore from the kiln 4at the bottom thereof, andalso furnish a and, further, admit of a large supply of airen tering thekiln at its bottom part, to increase the combustion and oxidation.

An opening or chamber, I, extends entirely through the lower part of themasonry F, and communicates at its middle point with a hole, J,extending in'a vertical directiouup through the center of the masonry Fto the interior ,of`

the kiln. A tube, K, extends down into the hole J. and is iirnilysecured therein. Said tube K extends up in a vertical position in meansof penetrating the interior of the kiln,

the center of the kiln, somewhat higher than the boshes C. Its top ismade closed and pointed, so as t-o penetrato and break up any r scaffoldor matting together of ore as it settles down from the roasting-zone.

The tube'K is provided with a number of holes or perforations, d,between the top I and bottom thereof, for the passage of air. 4 By meansof the opening or chamber I and the hole .I in the masonry F atmosphericair' is admitted through the holes d in the tubeK to the center, of themass of ore. It willthus be readily observed that by'means of theperforated tube K, extending up into the central part of the kiln andpenetrating the mass ofj,

ore, atmospheric air will be admited to the center of the mass of oreata point alittle be# low the roasting-zone, thus causing a more,thorough circulation of air through the center of the mass of ore,cooling the roasted product below, and producing a more intense andrapid .l

combustion. above.

Th edraft through the tube K may' be natural,

or produced by mechanical means, as desired.

face, instead -of being circular.

struction also allows-the ore to movemo'refd' .fectly and freely to thedeliveiychutes. The interior of the kiln at itsl besef-:llas

they will extend out upon the two oppositev sides ofthe kiln, two uponeach side, (sec Fig. 4,) so that the ore will be conducted to the carsupon opposite sides of the kiln.

Between the openings G, within the base of the kiln, I have arrangedsaddles M, or two sharp sloping planes, covering each of the foursidesof the Octagon, which are not opened for the escape of the. ore tothe chutes H. The

`ridge r top M" ol-'eaeh saddle M extends up about halt` of the heightof the slopes L and Slopes toward and meets the edges or intersec-Vtions L of said slopes L. (See Fig. l.) At the upper point of eachsaddle hl there is a hole, c, extending through the kiln for thepur- Ypose of permitting a our lo be thrust through 'plane slopes L of thepyramid L.

tothe interior oi' the kiln lo loosen the material. .n The saddles BIare for the purpose of directing the ore toward the chutes and towardthe The manner of construction of the slopesL "and saddles M aboredescribed is especially vadapted to provide for the uniform settling ofthe charge by the uniform drawing' of the ore. Having thus described themanner of con struction olf the lower part of my improved kiln, I willnew describe the manner ol" construction of the upper part. v

-The interior ot' the upper part of my kiln is contracted, forming thesection of a cone, as shown in Figs. l and 2. The exterior is of thesame cylindrical shape as the lower part thereof.

,Upcuthe top of the kiln I have constructed an annular chamber, E,extending around the top thereof, the outersides of which areiormed bycarrying up the iron jacket A with a thin lining of iire-lniek some twofeet above the top of the kiln proper. The bol-tom of the chamber N isl'ornied by the broadened top O 0f the sides of y:he kil proper, which.are thicker at itstop by reason of the interior of the kiln being ofcone-like construction, as above mentioned.

Iron beams or girdcrs l) are placed across and rest upon the top of thekiln proper. in Jthisjinstance have shown i'onr gir-ders for Supportingthe rails Q of a donbletrack which runs across the top oi' thev kiln forconveying the loaded cars, which are dumped directly into the top ol"the kiln through the open. spaces R between the tracks Q and the girdersP.

The top of the chamber N is formed by plates S, supported upon the topof the iron jacket A, carried up above the top of the interior of thekiln, as mentioned, and upon the top of the girders, l. tends betweenthe two inncrfgirders, P, as shown in Fig. l, so that the only openingthrough the top offhe kiln is between each. pair of tracks.

The outer girders, l,`iu connection with plates T, extending downbetween the tracks to the inner line ot' the kiln at its top, form theinner sidescf the chamber N, openings U- throngh the outer ends of thegirders P (see Fig. 3) allowingr the free passage of the gasesthroughout Vthe chamber Naud between the two inner girders under the topplate, S.

One or more stacks, Y, of any usual construction extend up from theannular chamber N, and furnish a means of escape lor the gasesarisingfrom the interior of the kiln, in

`the manner to bc hereinafter described, and

collecting in said chamber N.

One or more rows of lnes or openings, XV, which are shown in thedrawings arrangediu two rows, extend vertically through thewall aroundthe upper part of the kiln, where it iS 'of cone-like ponstruction, sothat the upper ends of said 'ilues or openings NV will open into thechamber'N at its lower part, as shown in Fig. 3, and the lower ends,meeting thesloping surface of the interior of the kiln, of conelikeconstruction, will cause the ends \V ofthe A central plate, S',rex- Lopenings to extend a long distance through v' the roasting 0re, as showniu Figs. l andv 2, so that a greater surface of ore will be reached. Thegas therefrom will pass through the open ings N and into the chamber Nand escape from there through the stacks V, the draft of which maybecontrolled in any well-known manner. v

It is very desirable that the gases formd by the roasting of the oreshould be immediately eliminated or removed from the interior of thekiln. The formation of these gases is contin ually going ou in whatistermed the roasting- ICO zone,7 in the upper part of the kiln; and if"some means be employed for connecting the interior of the kiln at theroasting-zone, where the gases are formed, with the exterior of the kilnby ilues or equivalent devices, so that the gases can be immediatelyeliminated or removed when formed, ,a much quicker oxidation and a morecomplete roasting of the ore will be effected. This Vis the object ofthe ilues kV, which tre made to extend down so that their lower openends W-ill be withinthe roastinglzone of the kiln. f The interior of theupper part of the ,shell A being conical and the lues XV beingvert-ical, as shown, their lower ends open for a considerable distanceat the interior ot' the kiln at lthe roasting-zone,

while their vertical direction' and the conical One purpose of theannular chamber NatI the top of the kiln, and which communicates heizenei l:he lilln nnlending iii. l A I o; ineM e the a them 'te cnlleeeii inanni 4vehnnihez .unil escape chene-Enom. enrengh eteeke; the nppei' endsof nie .eXenil n ,e hihi, shan greatly ineienning *die nn i ein in heand. :it the :e time/enr't ing lzhey ininiene gases ini@ ehe ein, so `nwel" non io interiee niihz'he nie hefinm inheore therein, enel nlthenjhthere epenings into ehe kiln, tineke, i@ allow ofjuhe ininnln'ot/iStill, hy rennen 0i' the manner 0i eenstinetion of vthe lippe* par()efifhe kiln, bhe ganen, ineteefl of passing diieeljg" nphiengh openingsbetween ,ernelie 'to men werking n-ien' the non o Ae iii', .l pass into'une chemhei ll and enla nl" 5; e eonneeiecl nlieiewiiih. Y

` The advantages ef olie manner e? eonsline ion'of myixnpieved lziln forinenting ore 'll Y. ,and nut o' stnnlislending thei'efin'sgniore rapidand vivid eomhnsion teken place, 'pre fY Vdneing higher oxidation andyielding nimm-e thoroughlyI roasted' and incx'ease nrorlne.

twill be nnders'cood that snlphniolnlneinA Y gas stops coinhustien,,nnil, ne in Lione, *chen twice as hczwy ne ein, il? il: isno; eniovedon its formnion ny n streng fait it feminins ningo1' charged together atthe up e nnekiln in euch 'proportions ne will continue eomlineion andcarry on the roasting of the ore, ell in the nsnnl and Wel-hmovvnmanners', enflifloyee in ronelfing kilns or i'ni'neccs of' e en ngenera-l use.

hee busen n in el eonsiiielahle above lhe op oi" Dion ein 1bn thecenters of inheir bases, anl f. nien hnff, "furnaces with sloping s en@eonienl a" per porti'fns have been inzien fled 'with nljleniiues, andl'. do not lihereA .foie n'ieh ne he nniieretood as' claiming Lhesefemm-es, h ioefily, inyvnvenbion comprising eertainnenr' `eenen-n@Lionsand combinations, es hereiianlei indicated. by my claims, 'by

by to eliminate" the gases from the kilns for roasting ore, what I claimtherein as new and ci my invennion, and desire to secure hy n, pezen?,is-` in n kiln for roasting ores, the combine ien, with the heeepinvided with the chamber l", nml the veri-ioni opening J',communicating ihcyewih, the cylinder or shell A, having ftheinwnifily-slopng boshes C, the deliveryeii- H, ehe pyramid L, the sidesL of which communicate with the said chiites, the enllee projecting npbetween the innen'ends of seni l eh nine eonininnicnmng with the saidopening J, anil pevie wih holes nigh up as the tops of the seid hoshes,snbstn-ntinlly es set; forthn 2. The comoinaion, with the lower part 0l'the kiln having he inwardyfsloping boshee and the central pex'fote eindpointed tube extending up asiigh as the tops of the said kiln, theinwardlyelopng Walls 0f which are provided with vertical lines W,extending down inno the ionstingzone of the kiln, the annularehaznhenhl, intowhich the said nee open n their topsfnnd; suitablestacks coni- .innnen-ting W ith :iz-.id chmnbcr, suhstantinllynn seh for7n. o

"en, with e, kiln having e, npper peri@ the inwardlyleping .33 nf whiennre nt-'ovided with vertical v ln, of the annuler cl1an1berN,into Wliieh,the sniv "nes open nl; their tops, the gireye l?, s 'if' hemelen theseid girders, the 'ming' ihc tup of bhe smid chamber,

wks "V, on se( forth.

nien/*Ann n. nnn'nn'n,

,n-e" ef the nn'ace more perfectly` the eent'nl pointed tube, El,

bonnes, ef the conical upperportion of the tending down into theroasting-zone ci' A o which ein enabled to get a more perfect drefnHnving thus described my improvements in

